In Madness Combat 4: Apotheosis, it re-appears with a more realistic design and is picked up by Hank. The gun in this has three settings: Safe, Semi and Mega. After Hank dispatches some grunts, he flicks the switch from "Semi" (semi-automatic) to "Mega," making the rifle fully automatic.
It also appears in Madness Combat 5: Depredation inside the car which Sanford and Deimos drive when they give Hank his dragon sword. In Madness Combat: 5.5 the gun randomly has a stock. It was gone from their car, meaning that it has been destroyed. It has appeared in nearly every animation since. It's most recent redesign is in Madness Combat 7: Consternation, where a stock has been added to the gun.
The AK-47 is also an automatic rifle featured in Madness Interactive and is able to kill a regular foe with two shots to the body. Although the AK-47 does not appear in Madness: Project Nexus, its smaller 5.45mm counterpart, the AK-74, does.
In Madness: Project Nexus 2 the AK-47 is renamed the AN-47, likely for copyright reasons.
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To view an article on the AK-47 from Wikipedia, click here.